Aircraft



FIG. 1 is a top plan view of the aircraft showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof with the opposite side being substantially a mirror image thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an aircraft, substantially as shown and described. 